Doped PANI Coated Nano-Ag Electrode for Rapid In-Situ Detection of Bromide in Seawater

Abstract

In this paper, we successfully fabricated a novel bromide ion selective electrode (Br-ISE), which was coated by bromine ion doped polyaniline as sensitive film. Using Ag wire as the substrate, a uniform and dense nano-silver layer was electroplated to enhance the specific surface area of the electrode. Subsequently, a polyaniline (PANI) film was coated onto the electrode by cyclic voltammetry in a 0.3 M aniline and 1 M HCl solution and was in-situ doped by 0.1 M KBr solution. The morphology and performance of the electrode were characterized by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and other electrochemical analysis methods, respectively. The prepared Br-ISE exhibited a wide linear dynamic range between 1.0 × 10−1 and 1.0 × 10−7 M with a near-Nernst slope of 57.33 mV/decade. In addition, the electrode possessed extremely fast response time (<1 s) and low impedance (300 Ω), high sensitivity, and good selectivity. The electrode potential drifted within 2 mV in 8 h. The lifespan was larger than three months.

An amphiprotic paper-based electrode for glucose detection based on layered carbon nanotubes with silver and polystyrene particles

“…The oxidation reaction mechanisms of Ag nanoparticles in basic solution were attributed to the generation of the strong oxidant AgO(OH) 2 , 65 whereas their mechanisms for glucose redox in neutral 66–68 and acidic solutions were not clear. 69–71 For the current CNT-NH 2 –Ag/PS paper electrode, the redox reaction of glucose was performed in a neutral solution (Na 2 SO 4 system). From the above discussion (Fig.…”

“…[62][63][64] whereas their mechanisms for glucose redox in neutral [66][67][68] and acidic solutions were not clear. [69][70][71] For the current CNT-NH 2 -Ag/PS paper electrode, the redox reaction of glucose was performed in a neutral solution (Na 2 SO 4 system). From the above discussion (Fig.…”

Monitor application of multi-electrochemical sensor in extracting bromine from seawater

“…Based on the previous study [39], the all-solid-state pH electrode was fabricated successfully. Using three-electrode system, Ir wire as the working electrode, the Ag/AgCl electrode as the reference electrode and the Pt as the auxiliary electrode, cyclic voltammetry of all three electrodes were scanned for three cycles at the scan rate of 50 mV s −1 in an aqueous solution of 5% LiOH at the potential range of 0–0.9 V and the Ir(OH)x film was electrodeposited on the surface of the Ir wire.…”

“…For all-solid-state ISEs, materials, such as glassy carbon [35], PVC filmogen [28,30,36,37], graphite [38] and silver strips [23], etc., were used as solid substrates. Based on our previous work, we fabricated a new all-solid-state Br-ISE-coated bromide ion-doped PANI electropolymerized film [39]. In addition, our research group successfully prepared an all-solid-state pH electrode-coated Ir/IrOH film on Ir wire [40].…”

A novel method for the preparation of conductive methyl cellulose-silver nanoparticles-polyaniline-nanocomposite

“…Aniline have been oxidized to polyaniline (PANi) using silver nitrate [24] or silver wire [14,25]. Subsequently, Ag+ ions are reduced to AgNPs [24,[26][27][28][29][30][31][32][33][34]. Doing so, both conductive PANi and conductive AgNps are produced.…”